Drawing pen



CHARLES w. THOMAS,

Application filed June 2,

To all whom t may concern.'

Be it known that I, CHARLES W.; THOMAS, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga, and State of Ohio, have invented certain new and useful Improvements in Drawing Pens, of which the following is a specification.`

y invention relates to drawing pens adapted for use as a free hand lettering pen or as a ruling pen and the objects of my invention are, first` to provide a pen wit-h an ink fountain enabling the draftsman to, do a maximum amount of work with a mini mum loss of time in filling; second, to provide a pen easy to clean; third, to provide means for adjusting the pen to execute varying widths of lines; fourth, to provide a nearly air tight pen thus preventing the ink from drying in the fountain; fifth, to provide a hinged constructionA making the inner parts easy of accessand also for holding the two parts of the pen together in a rigid and substantial manner; sixth, to provide a construction employing the minimum number of parts.

The above and other objects of my invention which will be apparent upon perusal of the specification are attained by the mechanism employed and illustrated in the accompanying drawings in whic Fig. 1, is a vertical longitudinal section, Fig. 2, is a rear end elevation. n

The base 1, the ink groove 3,.the groove 5, and the barrel 8, comprise the frame of my device. rl`he saidbase 1, is drilled at its rear end forming the barrel 8, for the reception of the spring 9. Said barrel extending from a distance back of the shoulder 7, to therear end of the frame. A distance from the rear end is formed the slot, in which the tang 13, of the hinged member 2, ishingedly secured by the rivet 6, which extends through the barrel 8, from side to side and is riveted on each side thereof. A plunger 16, is loosely disposed in the barrel 8, and is adapted to bear against the tang 18, above the ful! crum. The spring 9, abuts the said plunger 16, at its rear end, Adjustment of the pressure of the spring 9, against plunger 16, and the tang 13, is provided by the adjusting screw 15, in the end of the barrel 8. The said base 1, and hinged member 2, are provided with ink grooves 3, and 4, said grooves OF CLEVELAND, OHIO.

T i' GFF! C E DRAWING PEN.

1919. Serial No. 301,344.

are concave in form transversely and eX- tend longitudinally ofv said members. A distance from the rear terminal of said ink grooves are formed the semi-circular grooves 5, which when the two members are in closed position form an aperture for the admission of air Suhcient to prevent the ink in grooves 3- and 4, from backing up into the hinge idistance from the point is located the adjusting screw 10, whiohis disposed in a correspondingly threaded hole and passes thru the member 2, and into a hemispherical depression 12, in member 1, which has a twofold function', that of forming a seat for the end of the screw 10, and as an aligning means for the blade. The said screw 10, is adapted to force the two members 1 and 2, apart to afford variation in the width of lines and to add stability to the end of the blade 2. The barrel 8, is provided with a threaded portion 14, at its rear terminus adapted to receive the adjusting screw 15, said adjustingscrew 15, adapted to regulate the pressure of the spring 9,' against the tank 13, above the fulcrum 6, therebyv permittine` adjustment ofthe base and hinged members in relation to each other, by means of screw 10. The screw 15 is provided with a slot 17. to permit adjustment by use of a screw driver or other convenient means.

Byreferring to the drawings the operation of the pen will be'apparent. Ihen the blade 2, is raised the spring in barrel 8, is compressed and the blade is held in upright position. The ink grooves 3 and 4 can-then be readily cleaned or refilled as desired. When the blade 2, is closed the spring 9, will bear against the tang 13, on the member 2, above the fulcrum and force the point into close relation with the point of member 1.

I claimf 1. In a drafting pen, a stationary blade, a swinging bladepivotally connectedto said stationaryV blade, a cam face formed upon 2. lIn a drafting pen, a stationary blade s having a threaded bore in its butt end, a swinging blade pivotally Connected with said stationary blade ad'aoent said bore and provided adjacent its pivot with a cam face, 5 a member mounted within the bore, a compression spring Within the bore projecting said member for engagement with said cam face and means engaging the thread of said bore for adjusting the compression of: said. spring. 10 1n testimony whereof I afix my signature in the presence of two subscribing Witnesses.

. CHAS. YV. THOMAS. Witnesses:

THEO. M. FooKE,

EAsLIND CASE. 

